It’s easier to run the vent if you install a “power-vented” type of natural gas (or propane) water heater. Hot water is an amenity that most people just can't live without. Tankless water heaters can vent through the roof or a side wall, creating more flexibility and options for placement. I assume that operating with the gas valve pinched back will reduce the amount of heat the burner can provide and increase the recovery time. Flue Vent Connectors - Heating Boilers, Furnaces, Water Heaters & Chimney Flues A flue vent connector or "stackpipe" (orange in our sketch) is the term used to describe the round metal vent or connection pipe connected between the combustion gas exhaust port of an oil or gas fired heater or a wood or coal stove and the chimney that ultimately vents the combustion gases to the outdoors. If so, you are lucky to be alive and still have a house (or at least the roof). Maybe an open air duct in the attic, crawlspace (don’t have enough info on your entire system). Hi Mike, The general rule for venting two water heaters into a common connector is that its diameter must be equal or more than the larger diameter vent pipe + 50% of the smaller diameter vent pipe. You are welcome Jay, any home maintenance questions – just let me know. Also, well / municipal well water often contains anaerobic bacteria, which reacts with aluminum and magnesium anodes producing hydrogen sulfide gas, thus creating the rotten egg odor… (sodium from softening process makes it worse). DO NOT use regular duct tape to secure or seal connections. I am sure the stink smell coming out of the water heater after every re-boil cycle. Immediately to the left of the WH is the washer then the dryer to the far left. Natural gas or propane hot water heaters are generally less expensive to operate than electric heaters, but installing a standard vent in a house without an existing chimney is expensive. What are the requirements for power venting? Really we needed to add about 2-3 inches before it 90’s into chimney. When using water softener sodium is added in the process and anode rods tend to corrode much quicker, sometimes in as little as six months if the water is over-softened. Remove the anchoring screw from the base of the flue pipe. If I smell the fumes I turn off the AC fan the fume begin to vent properly than I am able to turn the AC back on, not the best solution but an effective one. It is caused by moisture condensation on the interior walls of the chimney and metal vent pipe. He said carbon monoxide will back into the basement. My vent pipes are 3 1/2 inch in diameter. The difference is that a power vent water heater pulls in combustion air from the space around the appliance, then uses a fan to propel the exhaust through the vent. After about ten minutes of operation the flame was much larger and nearly all yellow. The single-wall vent (about 4′) sits on top of the draft hood, and it’s vented straight up thru the roof with a cap. The top of the chimney is at least 36″ above the peak of the roof line. DO NOT use regular duct tape to secure or seal connections. The heat exchanger of a forced air furnace installed in a crawlspace has a tendency to deteriorate much faster due to excessive humidity and temperature variations. Most tank-type gas water heaters are “atmospheric vent” type, and they are required to vent vertically and above the roof of a home. Thanks. Mark: If you are sealing a gas fired water heater flue and are so far away from the heater (presumably on a basement or first floor) as to be at the roof, then sealing a metal flue joint with foil tape ought not cause an issue; I'm not sure why that's needed if you're using a UL-listed B-vent as those sections normally lock together. There are two other chimney ports for fireplaces, how can I direct the intake away from exhaust from the other ports (1 unused but functional wood fireplace in the middle and 1 seldom used natural gas fireplace on the other side)? The WH vent pipe / chimney drafting problems could be a result of the weather, combustion air problems inside your house, your house being too tight, some obstruction inside the chimney flue, oversized chimney, undersized chimney… So, without all those questions answered I can’t tell you what’s responsible for the melting, but it isn’t normal. The 2nd water heater will be the same, but i want to use the same vent pipe for both. You should have as much vertical rise as possible before there is a turn. Let me know if this helped and if you have any other questions. Otherwise, I’d look for some other source of that odor, a floor drain, open sewer line, sump / ejector pump well, etc. The appliance is still under warranty and you should call for the service ASAP. How To Know A Gas Water Heater Is Venting Safely? Check this – air return and combustion air. Because of a sealed combustion I wouldn’t try any repairs by yourself. Look to see if the draft hood over the vent hole is centered and if the legs are straight and secured by screws (this may depend on the design of the pipe). To fully understand house natural gas water heater venting I highly recommend reading House Brick Chimney Problems & Gas Water Heater and Furnace Chimney Flue Sizing posts – several of the water heater vent pipe conditions described below depend on properly operating and installed chimney! Chimney liner is currently required by code so if you’re performing major repairs on your chimney or replacing any of the appliances – it must be installed and appliances connected directly to the liner (rain cap is required too). I’m sure you’ve heard this a few times, but your website/information is very useful! For the gas water heater vent pipe system to operate properly its Draft Hood Has to be Centered over the vent hole, and its legs must be straight – any displaced or deformed draft hoods should be serviced / replaced if necessary. A. O. Smith power vent gas water heaters are equipped with an electric blower fan that is installed on top of the water heater, which requires an electrical outlet to be close to the water heater. Check all the fittings and connection points along the inlet … The tank is 21″ in diameter with a 24″ diameter aluminum leak pan under it. The new water heater has a sealed combustion chamber with a screened combustion air intake around the bottom. Get some estimates for each option. Most of the time these are made out of PVC. Storage tank propane water heaters vent through the roof using galvanized steel B-vents because they work through natural draft, allowing the hot exhaust air to rise up and out of the facility. By contrast, tankless water heaters’ vents can terminate on a side wall because their combustion fan blows exhaust from the units horizontally. If your closet is “air tight” and its interior provides the only combustion air source for the appliances it contains, open its doors while running HVAC and monitor your water heater’s operation. Let me know if this helps and NO, I don’t think that your water heater is defective, it’s just its safety feature response to the insufficient air supply. You should clean the venting on gas water heaters … Water heaters must be surrounded by a certain amount of clearance, or air space, to function properly and safely. However, this shouldn’t cause melting of that plastic, with a proper / strong draft, exhaust gases should be pulled through the vent pipe / chimney. Browse other questions tagged water-heater vent hot-water or ask your own question. at the hot water tap, then you must take special precautions. The laundry room is 17′ x 4′. The dryer has its own dedicated vent pipe to the side of the bldg. I have a gas water heater that vents out the chimney. The installer had an alternative water heater he recommended, but it did not have a power vent. According to the instructions this condition indicates a lack of combustion air and will produce excess soot. Can the flue vent for water heater be taped at the sections? They said nothing wrong. I have a new Rheem tankless condensing HWH and the only place to direct vent it is on to my patio 5′ away from my furnace exhaust. The 5 Best Electric Tankless Water Heaters for Endless Hot Water; Enjoy Endless Hot Water ... Types of tankless water heater vent termination kits. Water heater draft hoods serve a very important purpose and if not installed correctly, carbon monoxide gases may be expelled into the living space. The metal baffle inside the water heater’s flue pipe has nothing to do with the smell, it’s there to deflect heat towards the tank wall and increase the efficiency of the burning process. Properly venting your gas water heater can help cut back your energy bills because failing … The leak appears to be under the roof penetration for the gas tankless water heater. The gas supply valve is usually located on the … Thanks. Direct-vent units attract outside air from the house or building while power-vent units solely need an exhaust vent and should be installed in a larger area for receiving sufficient air amount for combustion. With the gas shutoff, it’s a good thing the heating season is over so we’ll only have to do without hot water until I can get the chimney/gas appliance companies in. When I turn on the hot water for about 45 seconds, I saw a small explosion (size of draft hood) from the WH by the draft hood. Inspect the water heater flue pipe. The water heater is vented through the old chimney for a fuel oil furnace which has been replaced with a high efficiency furnace and no longer uses that chimney. Occasionally, there might be some condensation developing inside the vent pipe and if you seal the cap on the bottom, it will just result in corrosion. Is that within the realm of possibilities and code compliance Thanks. Traditional gas tank water heater require venting through the roof. Always follow the appliance manufacturer’s recommendations and comply with your local code requirements – again – never downsize the water heater vent pipe! The natural draft water heater vent pipe always becomes hot with operating burner, but there shouldn’t be heat buildup around / outside of the draft hood. Let me know if you have any other questions, Thanks. maybe just laziness? I keep the “vent window” closed year-round and run a dehumidfier in the summer, but it’s a lost cause. This is NOT the hot water piping, but the exhaust vent DUCT (I said pipe in the title, sorry). According to the table on page 44 of the manual you can go 24″ above the roof (top of the chimney crown level) without any additional support. But now it’s perfect thanks to this video. It’s been like this for years. The easiest way would be to put a metal cap on the top of the chimney opening with one or two holes in it (depending on which installation you’re going to pick). Noise: These systems are noisy right out of the box and do not get better as time goes on, presenting potential problems for homeowners. The venting on gas water heaters carries away unburned gas fumes and provides a place for heat to escape. 4. new tankless water heater / eliminate the chimney / vent through the side wall of the house / you might need larger size gas line for it / the most expensive WH, probably around $2000 installed. Code expert Glenn Mathewson describes 10 common water-heater code issues, including confusion about drip pans and drains, unsupported expansion tanks and plastic vents, lack of combustion air, and more. How to Make Natural Wood Stain Using Coffee, Berries & More! It might run for a few more years or it might start leaking tomorrow. We just got done replacing our old water heater, and need to replace the vent pipe. The reason you use B vent pipe for the exterior wall is that it’s insulated to prevent excessive heat. Let me know if there’s anything else I could help you with…. Tighten loose pipe fittings. Remove the flue pipe. There are some rust & water stains near the water heater vent hoods. This will be a shutoff valve on the cold water pipe leading to the water heater. Rain water inside the chimney and condensation soaks into the brick / mortar / stone surface dissolving the alkaline salts. Hello, It looks like there’s enough of fresh air in that room and since you’ve clarified that second “explosion” it seams to be ignition delay issue. Powered by BizBudding Inc. 3. You’re welcome Matt, For the supports you can use plumbing pipe support clamps with horizontal rods attached to it and anchored to the chimney side walls. An additional reason why you will most likely need to upgrade your vent is most tankless water heaters use a powered fan to vent the unit. That white residue could be also a product (or partial product) of efflorescence. Due to some safety concerns this may not be approved by your local jurisdiction. The vent pipe has to run up hill a minimum of a quarter of an inch per foot. Single wall natural draft gas water heater vent pipe can not be used inside the walls, ceilings and any inaccessible areas – double wall type vent pipe / B-vent must be installed. Natural gas water heaters are located in the garage, exiting through the attic and the roof. I would like to close this up but I am not sure if that would present an issue due to the hot water heater being gas. I have just replaced a natural gas water heater and the burner flame is much too yellow. There is an easy to follow guide here – Hart & Cooley Type B Gas Vent & All-Fuel Chimney Sizing Guide – open the lower one of those 2 pdf files, go to page #8, it starts at “Single-Appliance Vent Systems”. Hi, I am adding a second hw heater to my house to serve the first floor( 2 family house). unfortunately it's a 2 story house with a moderately steep roof angle (so super scary to go on the roof). 1) Get chimney inspection. I’m pretty sure you’re aware how dangerous Carbon Monoxide can be…. Ventilated Water Heater. My question is ….. Is this a water heater issue or HVAC or chimney issue? A concentric vent termination may be used on a power direct vent tank or tankless water heater to get the same benefit of a single wall or roof penetration with an aesthetic vent termination. Inspect the water heater flue pipe. Gas service company rep said (on phone) “water leaks from vents” indicate chimney problem. Would that be a good sealer into the chimney? We were wondering if it would be cheaper to install an electric water heater and take out the chimney or replace the section that is bad. Power venting water heaters are considered more energy-efficient than a standard direct vent system and are more effective at preventing back draft air from entering the water heater. While replacing it you have 4 choices. Safe, non-combustible options include mortar, or potentially fiberglass insulation (as long as its paper has been removed). Recommended calling a chimney company. Do you know why a builder would not provide a bottom cap? Hi. Do I replace with double walled 3) Inspect gas equipment and/or replace due to age? If water is coming from the cold water supply line and the hot water pipe, you may be able to stop the leak by tightening a loose-fitting with a wrench. Most importantly, you will NOT stop a carbon monoxide leak by sealing this gap. WH vent pipes should be monitored periodically for corrosion and deterioration. Yes Karl, fire rated caulking would be good for this purpose. Go to this page: http://www.rheem.com/product.aspx?id=A1A75AAC-68F0-4C00-A8D3-37468E6D242A and open the “Use and Care Manual” pdf file (last one on the list). The 4′ section that is rusting out is from the roof line up. flue size diameter for a 3” water heater draft hood – between the table on my website and the table in Hart & Cooley PDF brochure (7” and 8”). Our last hot water heater vent that we will be talking about today is the power ventilated water heater. The water heater is 14 yrs. The material is also a factor as you can’t just put silicone on stainless steel to seal it. If I understand correctly, the builder forgot to put a chimney through the roof (the water heater and furnace vent pipes terminate in the attic?). There’s more about the water heater vent pipe in my article below the video. I am currently extending out a bath that will require me to swing the gas vent pipe more toward the exterior wall to enable me to move the bath tub. No chimney. Where to look for gaps or holes outside your home. Use B-vent pipe to penetrate your exterior wall. The typical answer to questions on how to properly vent a gas water heater is to vent it to the chimney through a galvanized metal duct or through the ceiling and attic using pipes. We recently replaced a very drafty sliding glass door with one that is energy star, tightening the house (so much so I often can’t hear my dog barking to be let back in). I have a nautual draft water heater can i change it to a induced draft by just adding a motor or is there something I ned to do ? Or gas water heaters are ventilated in two ways: power vent water heaters use fans to exhaust! More stable, and slight rust near screws call for the new water heater just. 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